Well, if they're good enough for US Navy Seal MK12 SPRs then they're good enough for me, who will almost exclusively hunt paper at an outdoor range. Another option to the set screw type would be to buy a clamp-on LP gas block. Discussion Starter • #1 • 10 mo ago. Usually set screw style gas blocks are lower profile, where clamp on take up just a bit more room. I … That being said, I ordered a SLR Sentry 7 set screw model and was accidently sent a clamping model. Some say that set screw gas blocks don't seal as well or cause accuracy issues. I have a carbine length gas system and the hand-guard is a Samson Evolution rail 9 Ex. I have one of these on my build. Clamp-On vs Set Screw Gas Block for AR-15 My plan is to install a Superlative Arms adjustable gas block on a Faxon gunner barrel. I have seen very fancy guns built both ways - I have a .750 contour Lothar Walther barreled gun that shoots .4 on average and has a set screw block. My LRAR is over gassed and I'm considering putting on an adjustable gas block. By turning the screw which has some nice clicks, you can choose the best kind of gas block performance you need. Regular Adjustable Gas Block. These gas blocks were designed to be used when a rail system/handguard that is mounted over the entire gas system. Just wondering if I should use the clamp-on version of the block or the set screw version. And my new JP has the clamped and shoots better than that with hand loads. This extra gas is sent forward out the barrel. If the gas block is properly installed then there won't be a difference between set screw and clamp on. I have 4 builds happening currently with barrels that are not dimpled for gas block set screws. Two major methods to attach the gas block to the barrel are set screws and clamp on. Without a dimple and I'm getting the clamp style just because I haven't spent the money on a jig yet, even though they are pretty cheap; Looking in the parts box I have 5 set screw types and 3 clamp on types. Im in the process of selecting a gas block now. Looking to see what the benefits and shortcomings of each set screw vs. clamp on … This block will not fit under the hand guard. From 0 to 4.5 turns, you restrict the flow of gas, which is what all the other adjustable gas blocks do. I think Robo hit the deciding factor for me, if the barrel has a dimple I'm going with the set screw for the clean look. Ive read where people worry about using set screws … 3,239 Posts . Looking to get a low profile Gas Block. Built to the tightest tolerances, the VLTOR low profile, clamp on and set screw gas blocks are small enough to fit inside most rail systems. I had always been told to use the clamp ons previously but questioning it now. Never had an issue with any of them and I don't baby anything. Get a quality LP gas block, set screw or clamp on, and move on. Its fun, but its also tedious to consider all the many choices necessary in building a 308AR. The gas clamp on and set screw Superlative Arms gas blocks happened because when went to pull parts did not have two set screw mount or two clamp on as wanted them identical. I ordered a YHM clamp style gas block because I heard that a clamp style will seal better and leak less gas. I have had no problem out of it in three years. I have NO experience with the set screws. Don't let something like that slow you down. I talked to guy, not sure what his experience is, but he said I can use a set screw style gas block, and the set screw force on the barrel will not affect the accuracy. Clamp on does make handguard selection a bit more challenging but is not any more difficult to line up with gas port in my opinion as have installed a boat load.

Because the rail goes over the Gas-Block, I don't really need an adjustable one. the number one concern for a gun that made of excellent parts is the barrel fit within the upper. I was a little offput at first, but after having used the clamping style I think they did me a favor by sending the wrong one. Superlative Gas Block.
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